[Fhb-update_ma] FHB Update from DE, 05/22/14
FHB Updates - Mid Atlantic SWW Region
fhb-update_ma at scabusa.org
Thu May 22 04:08:39 PDT 2014
Risk levels have returned to low levels as a result of the dry weekend
weather, which does not favor spore release and humidity favorable for
infection. I expect the risk level to rise slightly with rains received in
the area on the 21st and 22nd. Continue to monitor local forecasts and
fields that are approaching flowering. There is a 5-6 day window after the
majority of a field is flowering and conducive weather occurs to make a
fungicide application and maximize efficacy. The best fungicides for scab
are Prosaro, Caramba, and Proline. Do not apply products containing a
strobilurin (e.g. Aproach Prima, Quilt, Stratego, Headline, Quadris, etc) as
strobilurins have been associated with elevated DON levels when applied to
the head and scab occurs. Ground rigs should have nozzles angled at least 15
degrees in the forward direction (30 degrees is optimal) and apply at least
10 gallons per acre, with 15-20 being optimal. Aerial applicators should
apply at 5 gallons per acre. Shoot for 300 to 350 micron droplet size.
Prosaro, Caramba, and Proline will control foliar diseases.
--Nathan Kleczewski, Extension Specialist, University of Delaware
For more details, go to the FHB Risk assessment tool at
http://www.wheatscab.psu.edu
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